EP0511689B1 - Feed dog and throat plate assembly - Google Patents

Feed dog and throat plate assembly Download PDF

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Publication number
EP0511689B1
EP0511689B1 EP92110663A EP92110663A EP0511689B1 EP 0511689 B1 EP0511689 B1 EP 0511689B1 EP 92110663 A EP92110663 A EP 92110663A EP 92110663 A EP92110663 A EP 92110663A EP 0511689 B1 EP0511689 B1 EP 0511689B1
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EP
European Patent Office
Prior art keywords
feed dog
throat plate
slots
slot
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92110663A
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German (de)
French (fr)
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EP0511689A1 (en
Inventor
Patrick Gerardis
John Tester
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Adapt Engineering Pty Ltd
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Adapt Engineering Pty Ltd
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Publication of EP0511689A1 publication Critical patent/EP0511689A1/en
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Publication of EP0511689B1 publication Critical patent/EP0511689B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B33/00—Devices incorporated in sewing machines for supplying or removing the work
    • D05B33/02—Devices incorporated in sewing machines for supplying or removing the work and connected, for synchronous operation, with the work-feeding devices of the sewing machine
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements

Definitions

  • the present invention relates to a feed dog and throat plate assembly for a sewing machine and in particular an automatic sewing machine for hemming tee-shirt sleeves and body panels using a twin or three needle bottom cover stitch machine for federal stitch types 406 and 407.
  • a feed dog and throat plate assembly for a sewing machine is described in the document FR-A-2 388 918.
  • the aim of the invention is to provide a feed dog and throat plate assembly which allows the chaining off while being operated automatically.
  • a feed dog and throat plate assembly for an automatic sewing machine for hemming fabric and chaining off between fabric pieces comprising: a throat plate (24) having a first pair of longitudinally extending spaced apart parallel slots (29), and located therebetween, at one end, a second pair of parallel slots (23b) and a substantially c-shaped slot (39) which forms the chaining finger, and a first feed dog assembly (20) having two parallel feed dogs (43) adapted to operate in the first pair of slots (29) characterized in that it comprises a second feed dog assembly (40) comprising four feed dogs (41 and 42) which operate in the first (29) and second pair (23b) of slots respectively, a fifth slot (27) being located in the throat plate (24) at or just beyond the other end, such that a relatively large land (25) is formed between the chaining finger (22) and the fifth slot (27) sufficient to retain the chain stitch during chaining off; and a third feed dog (28) adapted to operate in the said fifth slot (27) and located on the first feed dog assembly.
  • an embodiment of the present invention is utilized in a bottom cover stitch sleeve hemmer for tee-shirts.
  • a twin or three needle bottom cover stitch machine (federal stitch types 406 and 407).
  • the sewing head (1) is coupled to a conveyor (2) which transports each piece of fabric (3) along the full length of the table (4) to an automatic stacking device (5).
  • the fabric can be pre-folded before sewing and is fed into both the folder (6) and the sewing head (1) by a top feed unit (7) which controls the rate at which the fabric is fed into the machine.
  • a trimmer (30) is located prior to the folder (6), and compresses a rotary cutter which cuts from beneath.
  • the fabric is firstly placed on the conveyor table (4) at a predetermined location.
  • the conveyor (2) then transports the fabric to a top feed unit (7) which feeds the fabric to the trimmer (30) and the folder (6) then to the sewing head (1). Once the fabric has been sewn the machine then chains off between pieces which in turn allows for automatic separation of each garment by a photocell activated chain cutter (8).
  • the fabric is then transported to the end of the table (4) where another photocell (9) activates the automatic stacker (5) which stacks each fabric piece neatly into a bundle. The cycle is automatically repeated.
  • a stop photocell 10 will automatically stop the machine thereby saving wastage of thread whilst chaining off.
  • a suitable top feed unit (7) is illustrated in Figures 3 and 4.
  • This feed unit automatically feeds the fabric into a trimmer and pre-folding device which then allows a tee-shirt sleeve to be automatically hemmed, and also for the controlled feed of fabric into the sewing machine.
  • This top feed unit (7) comprises a fabric guide strip (11) located on the feed end, a pressure plate (12) and a fabric drive belt (13) which is fed around the pulleys (14) and (15).
  • the belt is driven by a stepping motor (16) which is coupled to a synchronizer and is electronically controlled.
  • a schematic circuitry is shown in Figure 8.
  • the stepping motor drives the pulley (13) by way of a drive pulley (17) as shown in Figure 3.
  • the synchronizer (31) is coupled to the main shaft of the sewing head (2), thus it allows for monitoring of the speed of the sewing head as it accelerates and decelerates as well as for the feeding of the fabric at the same speed as the sewing head (1). This also allows the metering of the fabric into the machine such that it is possible to allow for pre-stretch or purposely overfeed to the sewing head at a precise metered rate to produce a flatter seam or a more precisely gathered seam as required.
  • the stepping motor (16) is coupled directly to the main frame on which are mounted the idler pulleys (14) and (15), the drive pulley (17), the pressure plate (12), tension springs (18) and the drive pulley (13). This produces a compact unit with a flexibility unknown to all prior art units.
  • the apparatus is fed by a three phase 220 volt power supply as shown in Fig. 9.
  • the synchronisation 31 monitors the speed of the sewing head 1 and feeds this signal into the main microprocessor control (32), where a signal is then forwarded to the stepping motor controller (33) to control the speed of the top feed stepping motor (16).
  • the respective photocells 9, 10, and 36 are connected through the main control (32) to operate respectively the stacker solenoid (34), the motor run solenoid (35) and chain cutter solenoid (37).
  • the throat plate (19) comprises two outer parallel slots (29) with a pair of parallel slots (23a) located therebetween at one end and a second pair of parallel slots (23b) located therebetween at the other end.
  • Intermediate said pairs of slots (23a) and (23b) is a c-shaped slot (39) which forms the chaining finger (22).
  • the standard throat plate (19) for a twin needle machine has a very small throat plate land (21) located between the chaining finger (22) and the central slots (23a) for the feed dogs of the foot assembly.
  • the chain stitch 38 would extend beyond the chaining finger (22) and between the central slots (23), and would be held in place by the sewing foot (not shown), as the chain stitch (38) is cut by the chain cutter (8) to separate the hemmed fabric piece.
  • the feed dogs (26) rise through the slots (23a) they raise the sewing foot (not shown) and free the chain stitch (38), which is pulled back into the c-shaped slot (39), and into the path of the looper (not shown) where the thread would be broken.
  • the throat plate (24) of the present invention is constructed differently from the standard throat plate (19) as can be seen in Fig. 7. This construction is necessary to allow the present invention to chain off while being operated automatically.
  • the throat plate land (25) has been greatly enlarged by the removal of the central slots (23a) for the middle two rows of foot dogs (26) of the foot assembly shown in Fig. 6.
  • a slot (27) is provided for an feed dog (28) just beyond the outer two feed dog slots (29). As can be seen in Fig.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Massaging Devices (AREA)
  • Inorganic Insulating Materials (AREA)

Abstract

There is provided a feed dog and throat plate assembly for an automatic sewing machine for Lemming fabric and chaining off between fabric pieces, which assembly comprises a throat plate (24) having a first pair of a feed dog and throat plate assembly for an automatic sewing machine for hemmmg fabric and chaining off between fabric pieces comprising: a throat plate (24) having a first pair of longitudinally extending spaced apart parallel slots (29), and located therebetween, at one end, a second pair of parallel slots (23b) and a substantially c-shaped slot (39), which forms the chaining finger, and a first feed dog assembly (20) having two parallel feed dogs (43) adapted to operate in the first pir of slots (29) and a second feed dog assembly (40) comprising four feed dogs (41 and 42) which operate in the first (29) and second pair (23b) of slots respectively characterised by a fifth slot (27) located in the throat plate (24) at or just beyond the other end, such that a relatively large land (25) is formed between the chaining finger (22) and the fifth slot (27) sufficient to retain the chain stitch during chaining off; and a third feed dog (28) adapted to operate in the said fifth slot (27). <IMAGE>

Description

  • The present invention relates to a feed dog and throat plate assembly for a sewing machine and in particular an automatic sewing machine for hemming tee-shirt sleeves and body panels using a twin or three needle bottom cover stitch machine for federal stitch types 406 and 407.
  • A feed dog and throat plate assembly for a sewing machine is described in the document FR-A-2 388 918.
  • The aim of the invention is to provide a feed dog and throat plate assembly which allows the chaining off while being operated automatically.
  • A feed dog and throat plate assembly for an automatic sewing machine for hemming fabric and chaining off between fabric pieces comprising:
       a throat plate (24) having a first pair of longitudinally extending spaced apart parallel slots (29), and located therebetween, at one end, a second pair of parallel slots (23b) and a substantially c-shaped slot (39) which forms the chaining finger, and
       a first feed dog assembly (20) having two parallel feed dogs (43) adapted to operate in the first pair of slots (29) characterized in that it comprises
       a second feed dog assembly (40) comprising four feed dogs (41 and 42) which operate in the first (29) and second pair (23b) of slots respectively, a fifth slot (27) being located in the throat plate (24) at or just beyond the other end, such that a relatively large land (25) is formed between the chaining finger (22) and the fifth slot (27) sufficient to retain the chain stitch during chaining off; and
       a third feed dog (28) adapted to operate in the said fifth slot (27) and located on the first feed dog assembly.
  • The present invention will now be described by way of example with reference to the accompanying drawings in which:
    • Fig. 1 illustrates a plan view of an automatic bottom cover stitch federal stitch type 406 and 407 sleeve hemmer for tee-shirts utilizing a feeder unit utilizing a feed dog and throat plate assembly of one embodiment of the present invention;
    • Fig. 2 illustrates an elevation view of the above hemmer;
    • Fig. 3 illustrates a schematic plan view of a feeder unit used in the hemmer of Figure 2.
    • Fig. 4 illustrates a schematic elevation view of the feeder unit of Figure 3;
    • Fig. 5 illustrates a prior art throat plate for a federal stitch type 406 and 407 bottom cover stitch machine;
    • Fig. 6 illustrates the feed dogs for the aforementioned prior art stitch machine.
    • Fig. 7 illustrates one embodiment of a throat plate according to the present invention;
    • Fig. 8 illustrates the feed dogs for the throat plate of Figure 7; and
    • Fig. 9 illustrates schematically the electronic circuitry for use with the present invention.
  • As shown in Figures 1 and 2, an embodiment of the present invention is utilized in a bottom cover stitch sleeve hemmer for tee-shirts. In a machine utilizing the present invention it is now possible to automate the operation of hemming tee-shirt sleeves and body panels using a twin or three needle bottom cover stitch machine (federal stitch types 406 and 407). The sewing head (1) is coupled to a conveyor (2) which transports each piece of fabric (3) along the full length of the table (4) to an automatic stacking device (5). The fabric can be pre-folded before sewing and is fed into both the folder (6) and the sewing head (1) by a top feed unit (7) which controls the rate at which the fabric is fed into the machine. A trimmer (30) is located prior to the folder (6), and compresses a rotary cutter which cuts from beneath.
  • The fabric is firstly placed on the conveyor table (4) at a predetermined location. The conveyor (2) then transports the fabric to a top feed unit (7) which feeds the fabric to the trimmer (30) and the folder (6) then to the sewing head (1). Once the fabric has been sewn the machine then chains off between pieces which in turn allows for automatic separation of each garment by a photocell activated chain cutter (8).
  • The fabric is then transported to the end of the table (4) where another photocell (9) activates the automatic stacker (5) which stacks each fabric piece neatly into a bundle. The cycle is automatically repeated.
  • If the operator does not re-load the fabric to be fed to the machine quickly enough, a stop photocell (10) will automatically stop the machine thereby saving wastage of thread whilst chaining off.
  • A suitable top feed unit (7) is illustrated in Figures 3 and 4. This feed unit automatically feeds the fabric into a trimmer and pre-folding device which then allows a tee-shirt sleeve to be automatically hemmed, and also for the controlled feed of fabric into the sewing machine. This top feed unit (7) comprises a fabric guide strip (11) located on the feed end, a pressure plate (12) and a fabric drive belt (13) which is fed around the pulleys (14) and (15). The belt is driven by a stepping motor (16) which is coupled to a synchronizer and is electronically controlled. A schematic circuitry is shown in Figure 8. The stepping motor drives the pulley (13) by way of a drive pulley (17) as shown in Figure 3.
  • The synchronizer (31) is coupled to the main shaft of the sewing head (2), thus it allows for monitoring of the speed of the sewing head as it accelerates and decelerates as well as for the feeding of the fabric at the same speed as the sewing head (1). This also allows the metering of the fabric into the machine such that it is possible to allow for pre-stretch or purposely overfeed to the sewing head at a precise metered rate to produce a flatter seam or a more precisely gathered seam as required. Further, in this embodiment, the stepping motor (16) is coupled directly to the main frame on which are mounted the idler pulleys (14) and (15), the drive pulley (17), the pressure plate (12), tension springs (18) and the drive pulley (13). This produces a compact unit with a flexibility unknown to all prior art units.
  • The apparatus is fed by a three phase 220 volt power supply as shown in Fig. 9. The synchronisation 31 monitors the speed of the sewing head 1 and feeds this signal into the main microprocessor control (32), where a signal is then forwarded to the stepping motor controller (33) to control the speed of the top feed stepping motor (16).
  • The respective photocells 9, 10, and 36 are connected through the main control (32) to operate respectively the stacker solenoid (34), the motor run solenoid (35) and chain cutter solenoid (37).
  • One embodiment of the present invention relates to the modification of the standard throat plate (19) and its foot assembly (20). The throat plate (19) comprises two outer parallel slots (29) with a pair of parallel slots (23a) located therebetween at one end and a second pair of parallel slots (23b) located therebetween at the other end. Intermediate said pairs of slots (23a) and (23b) is a c-shaped slot (39) which forms the chaining finger (22). As shown in Fig. 5 the standard throat plate (19) for a twin needle machine, has a very small throat plate land (21) located between the chaining finger (22) and the central slots (23a) for the feed dogs of the foot assembly.
  • The chain stitch 38 would extend beyond the chaining finger (22) and between the central slots (23), and would be held in place by the sewing foot (not shown), as the chain stitch (38) is cut by the chain cutter (8) to separate the hemmed fabric piece. As the feed dogs (26) rise through the slots (23a) they raise the sewing foot (not shown) and free the chain stitch (38), which is pulled back into the c-shaped slot (39), and into the path of the looper (not shown) where the thread would be broken.
  • The throat plate (24) of the present invention is constructed differently from the standard throat plate (19) as can be seen in Fig. 7. This construction is necessary to allow the present invention to chain off while being operated automatically. The throat plate land (25) has been greatly enlarged by the removal of the central slots (23a) for the middle two rows of foot dogs (26) of the foot assembly shown in Fig. 6. A slot (27) is provided for an feed dog (28) just beyond the outer two feed dog slots (29). As can be seen in Fig. 8, the two central rows of feed dogs (23a) have been eliminated and a central auxiliary feed dog (28) has been extended at the rear of the foot to allow the auxiliary feed dog (28) to feed the chain forward whilst the land (25) stops the thread from being pulled back into the path of the looper (not shown) and being broken as would normally be the case with the prior art machine. In use the sewing foot (not shown) holds the chain stick (38) on the land (25), however, contrary to prior art machines the chain stitch (38) lies across the central slot (27). Therefore, as the feed dogs rise through their respective slots, the auxiliary feed dog (28) engages the chain stitch (38) against the foot (not shown) to prevent the chain stitch from being pulled into the path of the looper.
  • The features disclosed in the foregoing description, in the claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realising the invention in diverse forms thereof.

Claims (3)

  1. A feed dog and throat plate assembly for an automatic sewing machine for hemming fabric and chaining off between fabric pieces comprising:
       a throat plate (24) having a first pair of longitudinally extending spaced apart parallel slots (29), and located therebetween, at one end, a second pair of parallel slots (23b) and a substantially c-shaped slot (39) which forms the chaining finger, and
       a first feed dog assembly (20) having two parallel feed dogs (43) adapted to operate in the first pair of slots (29) characterized in that it comprises
       a second feed dog assembly (40) comprising four feed dogs (41 and 42) which operate in the first (29) and second pair (23b) of slots respectively, a fifth slot (27) being located in the throat plate (24) at or just beyond the other end, such that a relatively large land (25) is formed between the chaining finger (22) and the fifth slot (27) sufficient to retain the chain stitch during chaining off; and
       a third feed dog (28) adapted to operate in the said fifth slot (27) and located on the first feed dog assembly.
  2. A feed dog and throat plate assembly according to claim 1 characterised in that said first pair (29) of longitudinally parallel spaced apart slots extend beyond the c-shaped slot (39).
  3. A feed dog and throat plate assembly according to claim 2 characterised in that said fifth slot (27) is substantially wider than the other slots (29, 23b) and in which a correspondingly shaped feed dog (28) engages.
EP92110663A 1988-06-02 1989-05-31 Feed dog and throat plate assembly Expired - Lifetime EP0511689B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPI858388 1988-06-02
AU8583/88 1988-06-02
EP89305484A EP0349129B1 (en) 1988-06-02 1989-05-31 Sewing machine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP89305484.1 Division 1989-05-31

Publications (2)

Publication Number Publication Date
EP0511689A1 EP0511689A1 (en) 1992-11-04
EP0511689B1 true EP0511689B1 (en) 1995-08-09

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EP92110663A Expired - Lifetime EP0511689B1 (en) 1988-06-02 1989-05-31 Feed dog and throat plate assembly
EP89305484A Expired - Lifetime EP0349129B1 (en) 1988-06-02 1989-05-31 Sewing machine

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89305484A Expired - Lifetime EP0349129B1 (en) 1988-06-02 1989-05-31 Sewing machine

Country Status (7)

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US (1) US5005502A (en)
EP (2) EP0511689B1 (en)
JP (1) JPH0229288A (en)
AT (2) ATE126283T1 (en)
CA (1) CA1328201C (en)
DE (2) DE68924561T2 (en)
ES (1) ES2018125A4 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918572A1 (en) * 1989-06-07 1990-12-13 Union Special Gmbh DEVICE FOR FORMING A THREADED CHAIN ON A MULTI-NEEDLE CHAIN STITCH SEWING MACHINE
US5174229A (en) * 1990-04-26 1992-12-29 Union Special Corporation Loading device for a sewing machine
CN108866850A (en) * 2018-09-10 2018-11-23 上海富山精密机械科技有限公司 A kind of sewing machine with resorption wire loop function
CN109706627B (en) * 2019-01-14 2021-02-02 杰克缝纫机股份有限公司 Sewing machine and feeding mechanism thereof

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DE308388C (en) * 1915-06-16
US1263088A (en) * 1915-07-20 1918-04-16 Union Special Machine Co Throat-plate for sewing-machines.
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US3782305A (en) * 1972-11-21 1974-01-01 Strong Robinette Bag Bag tube feeding and closing means
US3906878A (en) * 1974-02-15 1975-09-23 Perry E Burton Hemming method and apparatus
IT1077525B (en) * 1977-04-28 1985-05-04 Rockwell Rimoldi Spa PROCEDURE AND DEVICE TO PRODUCE A CONTINUOUS CHAIN OF STITCHES IN THE ABSENCE OF WORK IN TWO-NEEDLE MACHINES AND SINGLE CROCHET, WITHOUT COVERING
US4204492A (en) * 1978-07-17 1980-05-27 Levi Strauss & Co. Apparatus for hemming fabric pieces
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Also Published As

Publication number Publication date
US5005502A (en) 1991-04-09
ES2018125A4 (en) 1991-04-01
EP0349129A3 (en) 1990-04-18
CA1328201C (en) 1994-04-05
ATE126283T1 (en) 1995-08-15
EP0349129A2 (en) 1990-01-03
ATE129299T1 (en) 1995-11-15
DE68924561T2 (en) 1996-03-21
DE68924561D1 (en) 1995-11-23
EP0511689A1 (en) 1992-11-04
DE68923803T2 (en) 1995-12-07
EP0349129B1 (en) 1995-10-18
JPH0229288A (en) 1990-01-31
DE68923803D1 (en) 1995-09-14

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